Highmark said it will be making its MyBenefits defined contribution health insurance platform available to more businesses through the deal, which extends an existing relationship between the two companies through 2015. The deal also includes an investment by Highmark Health Services in Array Health.

"Two years ago, we selected Array Health as our private exchange vendor because of its extensive experience in establishing and maintaining this kind of platform," Steve Nelson, senior vice president of strategy, product and marketing at Highmark Health Services, said in a prepared statement. "It has been a wonderful relationship that exceeded our expectations."

MyBenefits began in 2011 as a pilot program. Businesses with under 100 employees can use the services to manage group health coverage costs. It is now being made available to large group businesses. It also will be offered in West Virginia and Delaware as of Jan. 1.